Add a note about running Doctrine commands on Windows

Author: javiereguiluz

doctrine.rst

@@ -368,7 +368,10 @@ you can query the database directly:
 
 .. code-block:: terminal
 
-    $ php bin/console doctrine:query:sql "SELECT * FROM product"
+    $ php bin/console doctrine:query:sql 'SELECT * FROM product'
+
+    # on Windows systems not using Powershell, run this command instead:
+    # php bin/console doctrine:query:sql "SELECT * FROM product"
 
 Take a look at the previous example in more detail: